Women should play dumb if they're looking for a fling.

In a study published in Evolution and Human Behavior, graduate students at the University of Texas–Austin found that that men were most attracted to women who appeared "dimwitted- or immature," or "sleepy or intoxicated" for a one-night stand (charming).

Women who appeared quick-witted and lucid, on the other hand, were found less physically attractive.

Thankfully, the opposite was true when men were seeking long-term partners.

The study found that men stared at a woman's lips for seven full seconds when they were colored red. In comparison, they spent just 0.95 seconds looking at her eyes and 0.85 seconds gazing at her hair.

The study found that women started thinking about a man more when she was uncertain if he really liked her or not. Then, she would conclude she liked him since she couldn't "get this guy out of her head."

Overall, the study suggested that if men hold back some of their feelings at the very beginning, and create some mystery, he'll be more likely to hook a member of the opposite sex.

Men need to take a deep breath and relax.

The researchers concluded that men with low stress levels are considered more attractive because handling a stressful situation suggests having a "strong" genetic makeup that can be passed on to children.